with a 2.84-inch E Ink touchscreen. It includes an for "tap-and-sign" functionality with your phone. The "Bitcoin Purist" Pick: Coldcard MK4
($55–$96): It has . You simply tap the card against your phone (via NFC) to sign transactions. It uses a bank-grade EAL6+ secure chip and is often sold in sets of 2 or 3 so the extra cards act as physical backups. Unique "Air-Gapped" Alternatives Keystone 3 Pro
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